As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE LAVATORY SMOKE 1 HOUR PRIOR TO LANDING. NO SIGN OF SMOKE OR FIRE IN ANY LAVATORY. GROUNDED - YES. RESET CIDS SDF AND PERFORMED OPS TEST OF ALL LAVATORY SMOKE DETECTION SYSTEMS PER AMM 26-17-00. OPS TEST OK. NO FAULTS NOTED. OK FOR SVC.